<template>
  <el-menu
    default-active="1-4-1"
    class="el-menu-vertical-demo"
    @open="handleOpen"
    @close="handleClose"
    :collapse="isCollapse"
    background-color="#2E2E2E"
    text-color="#f5f5f5"
    active-text-color="#cc0909"
  >
    <!-- 通过判断isCollapse来控制标题 -->
    <h3>
      {{ isCollapse ? '后台' : '通用后台管理系统' }}
    </h3>
    <!-- 渲染只有一级的菜单 -->
    <el-menu-item
      @click="clickMenu(item)"
      v-for="item in noChildren"
      :key="item.path"
      :index="item.path"
    >
      <i :class="'el-icon-' + item.icon"></i>
      <span>{{ item.label }}</span>
    </el-menu-item>

    <!-- 渲染只有二级的菜单 -->
    <el-submenu v-for="item in hasChildren" :key="item.path" :index="item.path">
      <template slot="title">
        <i :class="'el-icon-' + item.icon"></i>
        <span>{{ item.label }}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
        <el-menu-item :index="subItem.path" @click="clickMenu(subItem)">
          <i :class="'el-icon-' + item.icon"></i>
          {{ subItem.label }}
        </el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  height: 100vh;
  // background-color: #eaeaea;
  border: none;
  h3 {
    color: #cc0909;
    text-align: center;
    line-height: 48px;
    font-size: 20px;
    font-weight: 800;
  }
}
</style>

<script>
export default {
  data () {
    return {
      // isCollapse: false,
      menu: [
        {
          path: '/',
          name: 'home',
          label: '首页',
          icon: 's-home',
          url: 'Home/Home'
        },
        {
          path: '/mall',
          name: 'mall',
          label: '商品管理',
          icon: 'video-play',
          url: 'MallManage/MallManage'
        },
        {
          path: '/user',
          name: 'user',
          label: '用户管理',
          icon: 'user',
          url: 'UserManage/UserManage'
        },
        {
          label: '其他',
          icon: 'location',
          children: [
            {
              path: '/page1',
              name: 'page1',
              label: '页面1',
              icon: 'setting',
              url: 'Other/PageOne'
            },
            {
              path: '/page2',
              name: 'page2',
              label: '页面2',
              icon: 'setting',
              url: 'Other/PageTwo'
            }
          ]
        }
      ]
    }
  },
  computed: {
    noChildren () {
      return this.menu.filter(item => !item.children)
    },
    hasChildren () {
      return this.menu.filter(item => item.children)
    },
    isCollapse () {
      return this.$store.state.tab.isCollapse
    }
  },
  methods: {
    nandleOpen (key, keyPath) {
      console.log(key, keyPath)
    },
    handleClose (key, keyPath) {
      console.log(key, keyPath)
    },
    clickMenu (item) {
      this.$router.push({ name: item.name })
      this.$store.commit('selectMenu', item)
    }
  }
}
</script>
